<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="cart in cartInfoList" :key="cart.id">
          <li class="cart-list-con1">
            <input type="checkbox" name="chk_list" :checked="cart.isChecked" @change="updateChange(cart, $event)">
          </li>
          <li class="cart-list-con2">
            <img :src="cart.imgUrl">
            <div class="item-msg">{{cart.skuName}}</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{cart.cartPrice}}</span>
          </li>
          <li class="cart-list-con5">
            <a href="javascript:void(0)" class="mins" @click="handler('mins', -1, cart)">-</a>
            <input autocomplete="off" type="text" minnum="1" class="itxt" :value="cart.skuNum" @change="handler('change', $event, cart)">
            <a href="javascript:void(0)" class="plus" @click="handler('add', 1, cart)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{cart.skuNum * cart.cartPrice}}</span>
          </li>
          <li class="cart-list-con7">
            <a href="#none" class="sindelet" @click="deleteCart(cart)">删除</a>
            <br>
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" :checked="isAllChecked&&cartInfoList.length !==0" @click="trueAndFalse">
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="deleteAllChechedTrue">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>{{isTrueChecked}}</span>件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{isTruePrice}}</i>
        </div>
        <div class="sumbtn">
          <!-- <a class="sum-btn" href="###" target="_blank">结算</a> -->
          <router-link class="sum-btn" :to="{name: 'trade'}">结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { mapActions, mapGetters } from 'vuex'
// 引入 lodash 节流
import { throttle } from 'lodash'
export default {
  name: 'ShopCart',
  methods: {
    ...mapActions('shopCart', ['getShopCartList', 'deleteCartList', 'updateCheckedByid', 'trueAndFalseChecked', 'deleteAllCheched']),
    ...mapActions('detail', ['addOrUpdateShopCart']),
    // 修改商品 变化的量为 0 表示不变化 1 代表加1  [节流]
    handler: throttle(function (type, disNum, cart) {
      // type 点击类型 - +
      // disNum 值
      // cart 数组
      let changeNum = 0
      switch (type) {
        case 'mins':
          changeNum = cart.skuNum > 1 ? -1 : 0
          break
        case 'add':
          changeNum = 1
          break
        case 'change':
          // 等于NaN 或者 小于1
          if (isNaN(disNum.target.value * 1) || disNum < 1) {
            changeNum = 0
            disNum.target.value = cart.skuNum
          } else {
            // 如果 改变的值等于零， 让表单的value 等于 原来的 value
            if (Math.ceil(disNum.target.value) - cart.skuNum === 0) disNum.target.value = cart.skuNum
            changeNum = Math.ceil(disNum.target.value) - cart.skuNum
          }
          break
      }
      // 改变量 不等于0  发送请求
      if (changeNum !== 0) {
        this.addOrUpdateShopCart({ skuId: cart.skuId, skuNum: changeNum })
          .then(() => {
            // 改变之后向服务器获取新数据
            this.getShopCartList()
          })
          .catch(err => {
            console.log(err)
          })
      }
    }, 600),
    // 删除商品
    deleteCart(cart) {
      this.deleteCartList(cart.skuId)
        .then(() => {
          this.getShopCartList()
        })
        .catch(() => {
          console.log('删除失败')
        })
    },
    // 改变商品状态
    updateChange(cart, event){
      let isChecked = event.target.checked ? 1 : 0
      this.updateCheckedByid({skuId: cart.skuId, isChecked})
      .then(()=>{
        this.getShopCartList()
      })
      .catch((err)=>{
        console.log(err);
      })
    },
    // 总的全选全不选
    trueAndFalse(event){
      let resoult = event.target.checked ? 1 : 0
      this.trueAndFalseChecked(resoult)
      .then(() => {
        this.getShopCartList()
      })
      .catch(err => {
        console.log(err);
      })
    },
    // 删除选择的商品
    deleteAllChechedTrue(){
      this.deleteAllCheched()
      .then(()=>{
        // 成功发送请求
        this.getShopCartList()
      })
      .catch((err) => {
        console.log(err);
      })
    }
  },
  mounted() {
    this.getShopCartList()
  },
  computed: {
    ...mapGetters('shopCart', ['cartList']),
    // 购物车数据
    cartInfoList() {
      return this.cartList[0] ? this.cartList[0].cartInfoList : []
    },
    // 判断底部复选是否勾选
    isAllChecked() {
      return this.cartInfoList.every(item => item.isChecked === 1)
    },
    // 勾选总价钱
    isTruePrice(){
      return this.cartInfoList.filter(item => item.isChecked === 1 ).reduce((sum, item) => {
        return sum + item.cartPrice * item.skuNum
      }, 0)
    },
    // 勾选的 件数
    isTrueChecked(){
      return this.cartInfoList.filter(item => item.isChecked === 1 ).reduce((sum, item) => sum + item.skuNum, 0)
    }
  }
}
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }

        .cart-list-con1 {
          width: 15%;
        }

        .cart-list-con2 {
          width: 35%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }
        .cart-list-con4 {
          width: 10%;
        }

        .cart-list-con5 {
          width: 17%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 10%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 13%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: 'Microsoft YaHei';
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>